export const description = `
Validation tests for render pass resolve.
`;

import { makeTestGroup } from '../../../../common/framework/test_group.js';
import { GPUConst } from '../../../constants.js';
import { ValidationTest } from '../validation_test.js';

const kNumColorAttachments = 4;

export const g = makeTestGroup(ValidationTest);

g.test('resolve_attachment')
  .desc(
    `
Test various validation behaviors when a resolveTarget is provided.

- base case (valid).
- resolve source is not multisampled.
- resolve target is not single sampled.
- resolve target missing RENDER_ATTACHMENT usage.
- resolve target must have exactly one subresource:
    - base mip level {0, >0}, mip level count {1, >1}.
    - base array layer {0, >0}, array layer count {1, >1}.
    - TODO: test zero subresources
- resolve source and target have different formats.
    - rgba8unorm -> {bgra8unorm, rgba8unorm-srgb}
    - {bgra8unorm, rgba8unorm-srgb} -> rgba8unorm
    - test with other color attachments having a different format
- resolve source and target have different sizes.
`
  )
  .paramsSimple([
    // control case should be valid
    { _valid: true },
    // a single sampled resolve source should cause a validation error.
    { colorAttachmentSamples: 1, _valid: false },
    // a multisampled resolve target should cause a validation error.
    { resolveTargetSamples: 4, _valid: false },
    // resolveTargetUsage without RENDER_ATTACHMENT usage should cause a validation error.
    { resolveTargetUsage: GPUConst.TextureUsage.COPY_SRC, _valid: false },
    // non-zero resolve target base mip level should be valid.
    {
      resolveTargetViewBaseMipLevel: 1,
      resolveTargetHeight: 4,
      resolveTargetWidth: 4,
      _valid: true,
    },
    // a validation error should be created when mip count > 1
    { resolveTargetViewMipCount: 2, _valid: false },
    {
      resolveTargetViewBaseMipLevel: 1,
      resolveTargetViewMipCount: 2,
      resolveTargetHeight: 4,
      resolveTargetWidth: 4,
      _valid: false,
    },
    // non-zero resolve target base array layer should be valid.
    { resolveTargetViewBaseArrayLayer: 1, _valid: true },
    // a validation error should be created when array layer count > 1
    { resolveTargetViewArrayLayerCount: 2, _valid: false },
    { resolveTargetViewBaseArrayLayer: 1, resolveTargetViewArrayLayerCount: 2, _valid: false },
    // other color attachments resolving with a different format should be valid.
    { otherAttachmentFormat: 'bgra8unorm', _valid: true },
    // mismatched colorAttachment and resolveTarget formats should cause a validation error.
    { colorAttachmentFormat: 'bgra8unorm', _valid: false },
    { colorAttachmentFormat: 'rgba8unorm-srgb', _valid: false },
    { resolveTargetFormat: 'bgra8unorm', _valid: false },
    { resolveTargetFormat: 'rgba8unorm-srgb', _valid: false },
    // mismatched colorAttachment and resolveTarget sizes should cause a validation error.
    { colorAttachmentHeight: 4, _valid: false },
    { colorAttachmentWidth: 4, _valid: false },
    { resolveTargetHeight: 4, _valid: false },
    { resolveTargetWidth: 4, _valid: false },
  ] as const)
  .fn(async t => {
    const {
      colorAttachmentFormat = 'rgba8unorm',
      resolveTargetFormat = 'rgba8unorm',
      otherAttachmentFormat = 'rgba8unorm',
      colorAttachmentSamples = 4,
      resolveTargetSamples = 1,
      resolveTargetUsage = GPUTextureUsage.COPY_SRC | GPUTextureUsage.RENDER_ATTACHMENT,
      resolveTargetViewMipCount = 1,
      resolveTargetViewBaseMipLevel = 0,
      resolveTargetViewArrayLayerCount = 1,
      resolveTargetViewBaseArrayLayer = 0,
      colorAttachmentHeight = 2,
      colorAttachmentWidth = 2,
      resolveTargetHeight = 2,
      resolveTargetWidth = 2,
      _valid,
    } = t.params;

    // Run the test in a nested loop such that the configured color attachment with resolve target
    // is tested while occupying each individual colorAttachment slot.
    for (let resolveSlot = 0; resolveSlot < kNumColorAttachments; resolveSlot++) {
      const renderPassColorAttachmentDescriptors: GPURenderPassColorAttachment[] = [];
      for (
        let colorAttachmentSlot = 0;
        colorAttachmentSlot < kNumColorAttachments;
        colorAttachmentSlot++
      ) {
        // resolveSlot === colorAttachmentSlot denotes the color attachment slot that contains the color attachment with resolve
        // target.
        if (resolveSlot === colorAttachmentSlot) {
          // Create the color attachment with resolve target with the configurable parameters.
          const resolveSourceColorAttachment = t.device.createTexture({
            format: colorAttachmentFormat,
            size: {
              width: colorAttachmentWidth,
              height: colorAttachmentHeight,
              depthOrArrayLayers: 1,
            },
            sampleCount: colorAttachmentSamples,
            usage: GPUTextureUsage.COPY_SRC | GPUTextureUsage.RENDER_ATTACHMENT,
          });

          const resolveTarget = t.device.createTexture({
            format: resolveTargetFormat,
            size: {
              width: resolveTargetWidth,
              height: resolveTargetHeight,
              depthOrArrayLayers:
                resolveTargetViewBaseArrayLayer + resolveTargetViewArrayLayerCount,
            },
            sampleCount: resolveTargetSamples,
            mipLevelCount: resolveTargetViewBaseMipLevel + resolveTargetViewMipCount,
            usage: resolveTargetUsage,
          });

          renderPassColorAttachmentDescriptors.push({
            view: resolveSourceColorAttachment.createView(),
            loadValue: 'load',
            storeOp: 'discard',
            resolveTarget: resolveTarget.createView({
              dimension: resolveTargetViewArrayLayerCount === 1 ? '2d' : '2d-array',
              mipLevelCount: resolveTargetViewMipCount,
              arrayLayerCount: resolveTargetViewArrayLayerCount,
              baseMipLevel: resolveTargetViewBaseMipLevel,
              baseArrayLayer: resolveTargetViewBaseArrayLayer,
            }),
          });
        } else {
          // Create a basic texture to fill other color attachment slots. This texture's dimensions
          // and sample count must match the resolve source color attachment to be valid.
          const colorAttachment = t.device.createTexture({
            format: otherAttachmentFormat,
            size: {
              width: colorAttachmentWidth,
              height: colorAttachmentHeight,
              depthOrArrayLayers: 1,
            },
            sampleCount: colorAttachmentSamples,
            usage: GPUTextureUsage.COPY_SRC | GPUTextureUsage.RENDER_ATTACHMENT,
          });

          const resolveTarget = t.device.createTexture({
            format: otherAttachmentFormat,
            size: {
              width: colorAttachmentWidth,
              height: colorAttachmentHeight,
              depthOrArrayLayers: 1,
            },
            sampleCount: 1,
            usage: GPUTextureUsage.COPY_SRC | GPUTextureUsage.RENDER_ATTACHMENT,
          });

          renderPassColorAttachmentDescriptors.push({
            view: colorAttachment.createView(),
            loadValue: 'load',
            storeOp: 'discard',
            resolveTarget: resolveTarget.createView(),
          });
        }
      }
      const encoder = t.device.createCommandEncoder();
      const pass = encoder.beginRenderPass({
        colorAttachments: renderPassColorAttachmentDescriptors,
      });
      pass.endPass();

      t.expectValidationError(() => {
        encoder.finish();
      }, !_valid);
    }
  });
